jumpsuit

or jump suit

[ juhmp-soot ]
/ ˈdʒʌmpˌsut /

noun

a one-piece suit worn by parachutists for jumping.
a garment fashioned after this, usually combining a shirt or bodice with shorts or trousers in one piece.

Origin of jumpsuit

First recorded in 1940–45; jump + suit

British Dictionary definitions for jump suit

jump suit

noun

a one-piece garment of combined trousers and jacket or shirt